Valve assembly in a hydraulic control for a ratio controller in a power transmission

Abstract

A hydraulic control has a valve body assembly in which a plurality of control valves are contained. The valve body has separate structures which are secured together by fasteners. Separator plates are positioned between the structure levels to establish flow passages and sealing elements between fluid passages in the separate structures. The separator plate has two conical valve seats formed therein which cooperate with two pintle valves to control the flow of hydraulic fluid to and from a ratio controller within a power transmissions.

We claim: 
     
       1. A hydraulic control for a power transmission comprising: a source of hydraulic pressure;   a hydraulically operated torque transmitting ratio controller;   a valve positionable to direct hydraulic pressure from said source to said ratio controller;   a valve body supporting said valve;   a housing supporting fluid flow to and from said ratio controller;   a separator plate disposed between said valve body and said housing for directing the flow of hydraulic fluid therebetween, said separator plate defined by spaced parallel planes, said separator plate having an opening defining a conical valve seat formed thereon with material displaced from said spaced parallel planes; and   a spring loaded pintle valve having a conical valve portion urged into contact with said conical seat and a pintle portion extending through said opening, said pintle valve being responsive to hydraulic pressure from said valve to control hydraulic flow to said ratio controller.   
     
     
       2. A hydraulic control for a power transmission comprising: a source of hydraulic pressure;   a hydraulically operated ratio controller comprising a friction torque transmitting device having a pressure responsive piston;   valve means selectively positionable to direct hydraulic pressure from said source to said piston of said ratio controller;   a valve body slidably supporting said valve means;   a housing having passages for supplying hydraulic fluid to said ratio controller;   a separator plate disposed between said valve body and said housing for supplying hydraulic fluid to said ratio controller, said separator plate having upper and lower surfaces defined by spaced parallel planes, said separator plate having an opening defining a conical valve seat formed thereon with material of one of said upper and lower surfaces displaced from said spaced parallel planes; and   a spring loaded pintle valve having a conical valve portion urged into contact with said conical seat by a spring and a pintle portion extending through said opening, said pintle valve being responsive to hydraulic pressure from said valve means to control hydraulic flow to said piston.